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Rinnai Commercial Hybrid System Installation and Operation Manual
21
Twin Pipe Termination Clearances
Direct Vent
(Twin Pipe)
1
Combustion air and exhaust vent directly through separate
penetrations.
Twin Pipe Overview
Exhaust
Combustion
air
For illustration purposes only. Listed equivalent length is based on worst case scenario of
3 X 90° elbows or 18 equivalent ft.
Twin Pipe Vertical Termination
of Multiple Water Heaters
Combustion air termination not permitted in shaded area
Horizontal Vent and Combustion Air Piping
12 in. (0.30 m) above
grade or anticipated
snow level
12 in. (0.30 m) minimum
12 in. (0.30 m)
minimum above
combustion air
opening
Roof
12 in. (0.30 m) above
grade or anticipated
snow level
12 in. (0.30 m)
minimum
Exhaust
Combustion
Air
Exhaust
Zone
60 i
n. (
1.5 m
)
m
ini
m
u
m
12 in. (0.30 m)
minimum
Wall
Combustion
Air
Exhaust